I’m writing this letter ________ my mother, who wants to thank you for your nice gift.
Being poor, they had to build a__________ shelter out of tree trunks.
Jack's business is not as good as before, so he has to __________ the expenses of his company.
Look at the trouble I'm in! If only I__________ your advice.
—Do you know where David is? I couldn't find him anywhere.—Well. He __________ have gone far—his coat's still here.
—It's been a wonderful evening. Thank you very much.—__________.